- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - CCE-83149-5
  - CJIS-5.5.2
  - DISA-STIG-SLES-12-010390
  - NIST-800-53-AC-9
  - NIST-800-53-AC-9(1)
  - PCI-DSS-Req-10.2.4
  - PCI-DSSv4-10.2.1.4
  - configure_strategy
  - display_login_attempts
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed

- name: Ensure PAM Displays Last Logon/Access Notification - Check if /etc/pam.d/login
    file is present
  ansible.builtin.stat:
    path: /etc/pam.d/login
  register: result_pam_file_present
  when: '"pam" in ansible_facts.packages'
  tags:
  - CCE-83149-5
  - CJIS-5.5.2
  - DISA-STIG-SLES-12-010390
  - NIST-800-53-AC-9
  - NIST-800-53-AC-9(1)
  - PCI-DSS-Req-10.2.4
  - PCI-DSSv4-10.2.1.4
  - configure_strategy
  - display_login_attempts
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed

- name: Ensure PAM Displays Last Logon/Access Notification - Check the proper remediation
    for the system
  block:

  - name: Ensure PAM Displays Last Logon/Access Notification - Define the PAM file
      to be edited as a local fact
    ansible.builtin.set_fact:
      pam_file_path: /etc/pam.d/login

  - name: Ensure PAM Displays Last Logon/Access Notification - Check if system relies
      on authselect tool
    ansible.builtin.stat:
      path: /usr/bin/authselect
    register: result_authselect_present

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect custom
      profile is used if authselect is present
    block:

    - name: Ensure PAM Displays Last Logon/Access Notification - Check integrity of
        authselect current profile
      ansible.builtin.command:
        cmd: authselect check
      register: result_authselect_check_cmd
      changed_when: false
      failed_when: false

    - name: Ensure PAM Displays Last Logon/Access Notification - Informative message
        based on the authselect integrity check result
      ansible.builtin.assert:
        that:
        - result_authselect_check_cmd.rc == 0
        fail_msg:
        - authselect integrity check failed. Remediation aborted!
        - This remediation could not be applied because an authselect profile was
          not selected or the selected profile is not intact.
        - It is not recommended to manually edit the PAM files when authselect tool
          is available.
        - In cases where the default authselect profile does not cover a specific
          demand, a custom authselect profile is recommended.
        success_msg:
        - authselect integrity check passed

    - name: Ensure PAM Displays Last Logon/Access Notification - Get authselect current
        profile
      ansible.builtin.shell:
        cmd: authselect current -r | awk '{ print $1 }'
      register: result_authselect_profile
      changed_when: false
      when:
      - result_authselect_check_cmd is success

    - name: Ensure PAM Displays Last Logon/Access Notification - Define the current
        authselect profile as a local fact
      ansible.builtin.set_fact:
        authselect_current_profile: '{{ result_authselect_profile.stdout }}'
        authselect_custom_profile: '{{ result_authselect_profile.stdout }}'
      when:
      - result_authselect_profile is not skipped
      - result_authselect_profile.stdout is match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Define the new authselect
        custom profile as a local fact
      ansible.builtin.set_fact:
        authselect_current_profile: '{{ result_authselect_profile.stdout }}'
        authselect_custom_profile: custom/hardening
      when:
      - result_authselect_profile is not skipped
      - result_authselect_profile.stdout is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Get authselect current
        features to also enable them in the custom profile
      ansible.builtin.shell:
        cmd: authselect current | tail -n+3 | awk '{ print $2 }'
      register: result_authselect_features
      changed_when: false
      when:
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Check if any custom
        profile with the same name was already created
      ansible.builtin.stat:
        path: /etc/authselect/{{ authselect_custom_profile }}
      register: result_authselect_custom_profile_present
      changed_when: false
      when:
      - authselect_current_profile is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Create an authselect
        custom profile based on the current profile
      ansible.builtin.command:
        cmd: authselect create-profile hardening -b {{ authselect_current_profile
          }}
      when:
      - result_authselect_check_cmd is success
      - authselect_current_profile is not match("custom/")
      - not result_authselect_custom_profile_present.stat.exists

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect
        changes are applied
      ansible.builtin.command:
        cmd: authselect apply-changes -b --backup=before-hardening-custom-profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")
      - authselect_custom_profile is not match(authselect_current_profile)

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the authselect
        custom profile is selected
      ansible.builtin.command:
        cmd: authselect select {{ authselect_custom_profile }}
      register: result_pam_authselect_select_profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")
      - authselect_custom_profile is not match(authselect_current_profile)

    - name: Ensure PAM Displays Last Logon/Access Notification - Restore the authselect
        features in the custom profile
      ansible.builtin.command:
        cmd: authselect enable-feature {{ item }}
      loop: '{{ result_authselect_features.stdout_lines }}'
      register: result_pam_authselect_restore_features
      when:
      - result_authselect_profile is not skipped
      - result_authselect_features is not skipped
      - result_pam_authselect_select_profile is not skipped

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect
        changes are applied
      ansible.builtin.command:
        cmd: authselect apply-changes -b --backup=after-hardening-custom-profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - result_pam_authselect_restore_features is not skipped

    - name: Ensure PAM Displays Last Logon/Access Notification - Change the PAM file
        to be edited according to the custom authselect profile
      ansible.builtin.set_fact:
        pam_file_path: /etc/authselect/{{ authselect_custom_profile }}/{{ pam_file_path
          | basename }}
    when:
    - result_authselect_present.stat.exists

  - name: Ensure PAM Displays Last Logon/Access Notification - Check if expected PAM
      module line is present in {{ pam_file_path }}
    ansible.builtin.lineinfile:
      path: '{{ pam_file_path }}'
      regexp: ^\s*session\s+required\s+pam_lastlog.so\s*.*
      state: absent
    check_mode: true
    changed_when: false
    register: result_pam_line_present

  - name: Ensure PAM Displays Last Logon/Access Notification - Include or update the
      PAM module line in {{ pam_file_path }}
    block:

    - name: Ensure PAM Displays Last Logon/Access Notification - Check if required
        PAM module line is present in {{ pam_file_path }} with different control
      ansible.builtin.lineinfile:
        path: '{{ pam_file_path }}'
        regexp: ^\s*session\s+.*\s+pam_lastlog.so\s*
        state: absent
      check_mode: true
      changed_when: false
      register: result_pam_line_other_control_present

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the correct
        control for the required PAM module line in {{ pam_file_path }}
      ansible.builtin.replace:
        dest: '{{ pam_file_path }}'
        regexp: ^(\s*session\s+).*(\bpam_lastlog.so.*)
        replace: \1required \2
      register: result_pam_module_edit
      when:
      - result_pam_line_other_control_present.found == 1

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the required
        PAM module line is included in {{ pam_file_path }}
      ansible.builtin.lineinfile:
        dest: '{{ pam_file_path }}'
        insertafter: BOF
        line: session    required    pam_lastlog.so
      register: result_pam_module_add
      when:
      - result_pam_line_other_control_present.found == 0 or result_pam_line_other_control_present.found
        > 1

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect
        changes are applied
      ansible.builtin.command:
        cmd: authselect apply-changes -b
      when:
      - result_authselect_present is defined
      - result_authselect_present.stat.exists
      - |-
        (result_pam_module_add is defined and result_pam_module_add.changed)
         or (result_pam_module_edit is defined and result_pam_module_edit.changed)
    when:
    - result_pam_line_present.found is defined
    - result_pam_line_present.found == 0

  - name: Ensure PAM Displays Last Logon/Access Notification - Check if the required
      PAM module option is present in {{ pam_file_path }}
    ansible.builtin.lineinfile:
      path: '{{ pam_file_path }}'
      regexp: ^\s*session\s+required\s+pam_lastlog.so\s*.*\sshowfailed\b
      state: absent
    check_mode: true
    changed_when: false
    register: result_pam_module_showfailed_option_present

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the "showfailed"
      PAM option for "pam_lastlog.so" is included in {{ pam_file_path }}
    ansible.builtin.lineinfile:
      path: '{{ pam_file_path }}'
      backrefs: true
      regexp: ^(\s*session\s+required\s+pam_lastlog.so.*)
      line: \1 showfailed
      state: present
    register: result_pam_showfailed_add
    when:
    - result_pam_module_showfailed_option_present.found == 0

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect changes
      are applied
    ansible.builtin.command:
      cmd: authselect apply-changes -b
    when:
    - result_authselect_present.stat.exists
    - |-
      (result_pam_showfailed_add is defined and result_pam_showfailed_add.changed)
       or (result_pam_showfailed_edit is defined and result_pam_showfailed_edit.changed)
  when:
  - '"pam" in ansible_facts.packages'
  - result_pam_file_present.stat.exists
  tags:
  - CCE-83149-5
  - CJIS-5.5.2
  - DISA-STIG-SLES-12-010390
  - NIST-800-53-AC-9
  - NIST-800-53-AC-9(1)
  - PCI-DSS-Req-10.2.4
  - PCI-DSSv4-10.2.1.4
  - configure_strategy
  - display_login_attempts
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed

- name: Ensure PAM Displays Last Logon/Access Notification - Check if /etc/pam.d/login
    file is present
  ansible.builtin.stat:
    path: /etc/pam.d/login
  register: result_pam_file_present
  when: '"pam" in ansible_facts.packages'
  tags:
  - CCE-83149-5
  - CJIS-5.5.2
  - DISA-STIG-SLES-12-010390
  - NIST-800-53-AC-9
  - NIST-800-53-AC-9(1)
  - PCI-DSS-Req-10.2.4
  - PCI-DSSv4-10.2.1.4
  - configure_strategy
  - display_login_attempts
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed

- name: Ensure PAM Displays Last Logon/Access Notification - Check the proper remediation
    for the system
  block:

  - name: Ensure PAM Displays Last Logon/Access Notification - Define the PAM file
      to be edited as a local fact
    ansible.builtin.set_fact:
      pam_file_path: /etc/pam.d/login

  - name: Ensure PAM Displays Last Logon/Access Notification - Check if system relies
      on authselect tool
    ansible.builtin.stat:
      path: /usr/bin/authselect
    register: result_authselect_present

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect custom
      profile is used if authselect is present
    block:

    - name: Ensure PAM Displays Last Logon/Access Notification - Check integrity of
        authselect current profile
      ansible.builtin.command:
        cmd: authselect check
      register: result_authselect_check_cmd
      changed_when: false
      failed_when: false

    - name: Ensure PAM Displays Last Logon/Access Notification - Informative message
        based on the authselect integrity check result
      ansible.builtin.assert:
        that:
        - result_authselect_check_cmd.rc == 0
        fail_msg:
        - authselect integrity check failed. Remediation aborted!
        - This remediation could not be applied because an authselect profile was
          not selected or the selected profile is not intact.
        - It is not recommended to manually edit the PAM files when authselect tool
          is available.
        - In cases where the default authselect profile does not cover a specific
          demand, a custom authselect profile is recommended.
        success_msg:
        - authselect integrity check passed

    - name: Ensure PAM Displays Last Logon/Access Notification - Get authselect current
        profile
      ansible.builtin.shell:
        cmd: authselect current -r | awk '{ print $1 }'
      register: result_authselect_profile
      changed_when: false
      when:
      - result_authselect_check_cmd is success

    - name: Ensure PAM Displays Last Logon/Access Notification - Define the current
        authselect profile as a local fact
      ansible.builtin.set_fact:
        authselect_current_profile: '{{ result_authselect_profile.stdout }}'
        authselect_custom_profile: '{{ result_authselect_profile.stdout }}'
      when:
      - result_authselect_profile is not skipped
      - result_authselect_profile.stdout is match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Define the new authselect
        custom profile as a local fact
      ansible.builtin.set_fact:
        authselect_current_profile: '{{ result_authselect_profile.stdout }}'
        authselect_custom_profile: custom/hardening
      when:
      - result_authselect_profile is not skipped
      - result_authselect_profile.stdout is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Get authselect current
        features to also enable them in the custom profile
      ansible.builtin.shell:
        cmd: authselect current | tail -n+3 | awk '{ print $2 }'
      register: result_authselect_features
      changed_when: false
      when:
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Check if any custom
        profile with the same name was already created
      ansible.builtin.stat:
        path: /etc/authselect/{{ authselect_custom_profile }}
      register: result_authselect_custom_profile_present
      changed_when: false
      when:
      - authselect_current_profile is not match("custom/")

    - name: Ensure PAM Displays Last Logon/Access Notification - Create an authselect
        custom profile based on the current profile
      ansible.builtin.command:
        cmd: authselect create-profile hardening -b {{ authselect_current_profile
          }}
      when:
      - result_authselect_check_cmd is success
      - authselect_current_profile is not match("custom/")
      - not result_authselect_custom_profile_present.stat.exists

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect
        changes are applied
      ansible.builtin.command:
        cmd: authselect apply-changes -b --backup=before-hardening-custom-profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")
      - authselect_custom_profile is not match(authselect_current_profile)

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the authselect
        custom profile is selected
      ansible.builtin.command:
        cmd: authselect select {{ authselect_custom_profile }}
      register: result_pam_authselect_select_profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - authselect_current_profile is not match("custom/")
      - authselect_custom_profile is not match(authselect_current_profile)

    - name: Ensure PAM Displays Last Logon/Access Notification - Restore the authselect
        features in the custom profile
      ansible.builtin.command:
        cmd: authselect enable-feature {{ item }}
      loop: '{{ result_authselect_features.stdout_lines }}'
      register: result_pam_authselect_restore_features
      when:
      - result_authselect_profile is not skipped
      - result_authselect_features is not skipped
      - result_pam_authselect_select_profile is not skipped

    - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect
        changes are applied
      ansible.builtin.command:
        cmd: authselect apply-changes -b --backup=after-hardening-custom-profile
      when:
      - result_authselect_check_cmd is success
      - result_authselect_profile is not skipped
      - result_pam_authselect_restore_features is not skipped

    - name: Ensure PAM Displays Last Logon/Access Notification - Change the PAM file
        to be edited according to the custom authselect profile
      ansible.builtin.set_fact:
        pam_file_path: /etc/authselect/{{ authselect_custom_profile }}/{{ pam_file_path
          | basename }}
    when:
    - result_authselect_present.stat.exists

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure the "silent"
      option from "pam_lastlog.so" is not present in {{ pam_file_path }}
    ansible.builtin.replace:
      dest: '{{ pam_file_path }}'
      regexp: (.*session.*pam_lastlog.so.*)\bsilent\b=?[0-9a-zA-Z]*(.*)
      replace: \1\2
    register: result_pam_option_removal

  - name: Ensure PAM Displays Last Logon/Access Notification - Ensure authselect changes
      are applied
    ansible.builtin.command:
      cmd: authselect apply-changes -b
    when:
    - result_authselect_present.stat.exists
    - result_pam_option_removal is changed
  when:
  - '"pam" in ansible_facts.packages'
  - result_pam_file_present.stat.exists
  tags:
  - CCE-83149-5
  - CJIS-5.5.2
  - DISA-STIG-SLES-12-010390
  - NIST-800-53-AC-9
  - NIST-800-53-AC-9(1)
  - PCI-DSS-Req-10.2.4
  - PCI-DSSv4-10.2.1.4
  - configure_strategy
  - display_login_attempts
  - low_complexity
  - low_disruption
  - low_severity
  - no_reboot_needed

# Remediation is applicable only in certain platforms
if rpm --quiet -q pam; then

if [ -e "/etc/pam.d/login" ] ; then
    PAM_FILE_PATH="/etc/pam.d/login"
    if [ -f /usr/bin/authselect ]; then
        
        if ! authselect check; then
        echo "
        authselect integrity check failed. Remediation aborted!
        This remediation could not be applied because an authselect profile was not selected or the selected profile is not intact.
        It is not recommended to manually edit the PAM files when authselect tool is available.
        In cases where the default authselect profile does not cover a specific demand, a custom authselect profile is recommended."
        exit 1
        fi

        CURRENT_PROFILE=$(authselect current -r | awk '{ print $1 }')
        # If not already in use, a custom profile is created preserving the enabled features.
        if [[ ! $CURRENT_PROFILE == custom/* ]]; then
            ENABLED_FEATURES=$(authselect current | tail -n+3 | awk '{ print $2 }')
            authselect create-profile hardening -b $CURRENT_PROFILE
            CURRENT_PROFILE="custom/hardening"
            
            authselect apply-changes -b --backup=before-hardening-custom-profile
            authselect select $CURRENT_PROFILE
            for feature in $ENABLED_FEATURES; do
                authselect enable-feature $feature;
            done
            
            authselect apply-changes -b --backup=after-hardening-custom-profile
        fi
        PAM_FILE_NAME=$(basename "/etc/pam.d/login")
        PAM_FILE_PATH="/etc/authselect/$CURRENT_PROFILE/$PAM_FILE_NAME"

        authselect apply-changes -b
    fi
    if ! grep -qP '^\s*session\s+'"required"'\s+pam_lastlog.so\s*.*' "$PAM_FILE_PATH"; then
            # Line matching group + control + module was not found. Check group + module.
            if [ "$(grep -cP '^\s*session\s+.*\s+pam_lastlog.so\s*' "$PAM_FILE_PATH")" -eq 1 ]; then
                # The control is updated only if one single line matches.
                sed -i -E --follow-symlinks 's/^(\s*session\s+).*(\bpam_lastlog.so.*)/\1'"required"' \2/' "$PAM_FILE_PATH"
            else
                sed -i --follow-symlinks '1i session     '"required"'    pam_lastlog.so' "$PAM_FILE_PATH"
            fi
        fi
        # Check the option
        if ! grep -qP '^\s*session\s+'"required"'\s+pam_lastlog.so\s*.*\sshowfailed\b' "$PAM_FILE_PATH"; then
            sed -i -E --follow-symlinks '/\s*session\s+'"required"'\s+pam_lastlog.so.*/ s/$/ showfailed/' "$PAM_FILE_PATH"
        fi
    if [ -f /usr/bin/authselect ]; then
        
        authselect apply-changes -b
    fi
else
    echo "/etc/pam.d/login was not found" >&2
fi
if [ -e "/etc/pam.d/login" ] ; then
    PAM_FILE_PATH="/etc/pam.d/login"
    if [ -f /usr/bin/authselect ]; then
        
        if ! authselect check; then
        echo "
        authselect integrity check failed. Remediation aborted!
        This remediation could not be applied because an authselect profile was not selected or the selected profile is not intact.
        It is not recommended to manually edit the PAM files when authselect tool is available.
        In cases where the default authselect profile does not cover a specific demand, a custom authselect profile is recommended."
        exit 1
        fi

        CURRENT_PROFILE=$(authselect current -r | awk '{ print $1 }')
        # If not already in use, a custom profile is created preserving the enabled features.
        if [[ ! $CURRENT_PROFILE == custom/* ]]; then
            ENABLED_FEATURES=$(authselect current | tail -n+3 | awk '{ print $2 }')
            authselect create-profile hardening -b $CURRENT_PROFILE
            CURRENT_PROFILE="custom/hardening"
            
            authselect apply-changes -b --backup=before-hardening-custom-profile
            authselect select $CURRENT_PROFILE
            for feature in $ENABLED_FEATURES; do
                authselect enable-feature $feature;
            done
            
            authselect apply-changes -b --backup=after-hardening-custom-profile
        fi
        PAM_FILE_NAME=$(basename "/etc/pam.d/login")
        PAM_FILE_PATH="/etc/authselect/$CURRENT_PROFILE/$PAM_FILE_NAME"

        authselect apply-changes -b
    fi
    
if grep -qP '^\s*session\s.*\bpam_lastlog.so\s.*\bsilent\b' "$PAM_FILE_PATH"; then
    sed -i -E --follow-symlinks 's/(.*session.*pam_lastlog.so.*)\bsilent\b=?[[:alnum:]]*(.*)/\1\2/g' "$PAM_FILE_PATH"
fi
    if [ -f /usr/bin/authselect ]; then
        
        authselect apply-changes -b
    fi
else
    echo "/etc/pam.d/login was not found" >&2
fi

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi